php用for和while循环语句输出倒装的99乘法表

Question

php用for和while循环语句输出倒装的99乘法表，对齐。

Answer 1

        for ($i = 9; $i >= 1; $i--) {
            for ($j = 1; $j <= $i; $j++) {
                echo $i . "X" . $j . "=" . $i * $j . " ";
            }
            echo "<br />";
        }

        $x = 9;
        while ($x >= 1) {

            $y = 1;
            while ($y <= $x) {
                echo $x . "X" . $y . "=" . $x * $y . " ";
                $y++;
            }
            $x--;
            echo "<br>";

        }